Nonlinear least-mean-squares type algorithm for second-order interference cancellation in LTE-A RF transceivers

Gebhard, Andreas; Kanumalli, Ram Sunil; Pretl, Harald; Huemer, Mario

doi:10.1109/acssc.2017.8335457

Cited by 18 publications

(17 citation statements)

References 15 publications

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“…Assuming an IIP2 of 60 dBm, the resulting BB IMD2 power with a full allocated LTE10 QPSK modulated transmission and the determined correction factor of CF = 13.4 dB is P CSF,LTE IM2 = 2P TxL RF − IIP2 − CF = −87.4 dBm [6]. In an LTE10 reference sensitivity case, the wanted signal power at the antenna can be as low as -97 dBm [18].…”

Section: Problem Statementmentioning

confidence: 99%

“…The IIP2 is improved from +50 dBm to 68.4 dBm and 67 dBm by the digital cancellation with the IM2RLS w/o and w/ DC suppression, respectively. The correction factor of 13.4 dB corrects the IMD2 power calculated with the 2-tone formula, to the channel-select, and DCfiltered in-band IMD2 power for the LTE10 full allocation case [6]. For the calculation of the A common method to overcome the problem of badly-conditioned autocorrelation matrices is regularization [28].…”

Section: Performance Of the Im2rls With DC Suppressionmentioning

confidence: 99%

“…The mathematical modeling in [6,7] shows that the BB IMD2 interference contains the squared envelope of the BB equivalent TxL signal. The resulting BB IMD2 interference has twice the Tx signal bandwidth and contains a DC due to the envelope-squaring.…”

Section: Introductionmentioning

confidence: 99%

“…Consequently, the IMD2 interference related DC is removed from the received signal which complicates the IMD2 replica estimation. This DC removal is considered in [6,11], and neglected in [7]- [9,14]. [6] with improved steady-state cancellation and convergence speed.…”

Section: Introductionmentioning

confidence: 99%

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A Robust Nonlinear RLS Type Adaptive Filter for Second-Order-Intermodulation Distortion Cancellation in FDD LTE and 5G Direct Conversion Transceivers

Gebhard

Lang

Lunglmayr

et al. 2019

IEEE Trans. Microwave Theory Techn.

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Transceivers operating in frequency division duplex experience a transmitter leakage (TxL) signal into the receiver due to the limited duplexer stop-band isolation. This TxL signal in combination with the second-order nonlinearity of the receive mixer may lead to a baseband (BB) second-order intermodulation distortion (IMD2) with twice the transmit signal bandwidth. In direct conversion receivers, this nonlinear IMD2 interference may cause a severe signal-to-interference-plus-noise ratio degradation of the wanted receive signal. This contribution presents a nonlinear Wiener model recursive-least-squares (RLS) type adaptive filter for the cancellation of the IMD2 interference in the digital BB. The included channel-select-, and DC-notch filter at the output of the proposed adaptive filter ensure that the provided IMD2 replica includes the receiver front-end filtering. A second, robust version of the nonlinear RLS algorithm is derived which provides numerical stability for highly correlated input signals which arise in e.g. LTE-A intra-band multi-cluster transmission scenarios. The performance of the proposed algorithms is evaluated by numerical simulations and by measurement data.

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Section: Problem Statementmentioning

confidence: 99%

Section: Performance Of the Im2rls With DC Suppressionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A Robust Nonlinear RLS Type Adaptive Filter for Second-Order-Intermodulation Distortion Cancellation in FDD LTE and 5G Direct Conversion Transceivers

Gebhard

Lang

Lunglmayr

et al. 2019

IEEE Trans. Microwave Theory Techn.

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“…Foremost, analog mitigation techniques like fully-differential symmetrical structures or on-chip isolation techniques are used. But, as the results are often insufficient in terms of performance for the large number band combinations and scenarios, further adaptive digital signal processing is used to compensate for those coupling effects [13,35].…”

Section: Simplified Lte-advanced Transceiver Architecturementioning

confidence: 99%

From microwatt to gigabit: challenges of modern radio design

Pretl¹,

Faseth²,

Schumacher³

et al. 2018

Elektrotech. Inftech.

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On the brink of introducing the fifth generation (5G) of cellular networks, the art of radio-frequency (RF) integrated circuit design has never seen such a wide spread of diverging requirements:On the one hand, ubiquitous sensor networks are mandating power budgets in the order of micro-watt. They should be constructed as energy-autonomous, wireless, low-cost sensor nodes. This demand is caused by massive deployment scenarios of billions of devices, which makes wires and batteries unpractical. As a result, the desire for the radio nodes to harvest their operational energy from the environment emerges.On the other hand, the recent and ongoing realization of gigabit-per-second capable cellular modems is driving hardware and power requirements to extremes. To overcome hardware limitations, introduced by analog impairments, digital correction and alignment algorithms are employed for compensation. These factors call for usage of expensive advanced CMOS technology nodes and increased utilization of digital signal processing techniques.In this paper, we recap ongoing trends and developments for ultra-low power and high-end transceiver (TRX) designs using CMOS technology nodes ranging from low-cost to highest performance.Keywords: RF; ultra-low-power; wireless architectures; transceiver; mixed-signal circuits; 5G Von Mikrowatt zu Gigabit: Herausforderungen beim Design moderner Funkübertragungssysteme. Neben der Einführung der zellularen Mobilfunknetze der fünften Generation (5G) muss sich auch die integrierte HochfrequenzSchaltungstechnik einer noch nie dagewesenen Breite an unterschiedlichen Anforderungen stellen: Auf der einen Seite gibt es überall kabellose Sensornetzwerke, denen nur eine geringe Menge an Versorgungsleistung im MikrowattBereich zur Verfügung steht. Daher müssen die Chips in diesem Bereich energieautark und möglichst kostengünstig entwickelt werden. Aufgrund der zu erwartenden hohen Stückzahlen (Milliarden von unterschiedlichsten Sensoren für verschiedene Anwendungen) sind eine drahtgebundene Energieversorgung oder der Einsatz von Batterien in vielen Fällen praktisch unmöglich. Somit wird es für die Sensoren immer wichtiger, ihre Energieversorgung aus der Umgebung zu gewinnen (Stichwort Energy Harvesting).

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Kernel Adaptive Filters: A Panacea for Self-interference Cancellation in Mobile Communication Transceivers?

Auer

Gebhard

Paireder

et al. 2020

Computer Aided Systems Theory – EUROCAST 2019

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Nonlinear least-mean-squares type algorithm for second-order interference cancellation in LTE-A RF transceivers

Cited by 18 publications

References 15 publications

A Robust Nonlinear RLS Type Adaptive Filter for Second-Order-Intermodulation Distortion Cancellation in FDD LTE and 5G Direct Conversion Transceivers

A Robust Nonlinear RLS Type Adaptive Filter for Second-Order-Intermodulation Distortion Cancellation in FDD LTE and 5G Direct Conversion Transceivers

From microwatt to gigabit: challenges of modern radio design

Kernel Adaptive Filters: A Panacea for Self-interference Cancellation in Mobile Communication Transceivers?

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